English translation: live interactive internet / web classes
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Explanation: I am just guessing, there is not enough context.
But I believe that the screens change every day, such as the Proz screen changes, and that the students must answer the questions at the time they are posted.
I am not completely sure of my answer.
Robert INGLEDEW Argentina Local time: 15:29 Native speaker of: English, Spanish PRO pts in pair: 1940